Hides one's relatives on board (5)
I believe the answer is:
skins
'hides' is the definition.
('skin' can be a synonym of 'hide')
'relatives on board' is the wordplay.
'relatives' becomes 'kin' (I've seen this before).
'on' indicates putting letters inside.
'board' becomes 'ss' (I've seen this in other clues).
'kin' going within 'ss' is 'SKINS'.
'one's' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Another definition for skins that I've seen is " Pelts".)